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<!DOCTYPE html>
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<script src="resources/open-blank-host.js"></script>
<script>
function nextEvent(target, type) {
return new Promise((resolve, reject) => target.addEventListener(type, e => resolve(e), {once: true}));
}
function timePasses(delay) {
return new Promise((resolve, reject) => step_timeout(() => resolve(), delay));
}
promise_test(async () => {
assert_implements("HTMLPortalElement" in self);
const w = await openBlankPortalHost();
try {
const portal = w.document.createElement('portal');
portal.src = new URL('resources/simple-portal.html', location.href);
w.document.body.appendChild(portal);
await nextEvent(portal, 'load');
const pagehideFired = nextEvent(w, 'pagehide');
const unloadFired = nextEvent(w, 'unload');
await portal.activate();
assert_true((await pagehideFired) instanceof w.PageTransitionEvent);
assert_true((await unloadFired) instanceof w.Event);
} finally {
w.close();
}
}, "pagehide and unload should fire if the predecessor is not adopted");
promise_test(async () => {
assert_implements("HTMLPortalElement" in self);
localStorage.setItem('predecessor-fires-unload-events', '');
window.open('resources/predecessor-fires-unload-watch-unload.html', '_blank', 'noopener');
while (localStorage.getItem('predecessor-fires-unload-events') != 'pagehide unload') {
await timePasses(50);
}
}, "pagehide and unload should fire if the predecessor is not adopted, even without a window/opener association");
</script>
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